Compagnie Generale Des Etablissements Michelin

Michelin Recherche Et Technique S.a.

Compagnie Generale Des Etablissments Michelin

Olivier Spinnler

Franck Nugier

Frédéric Massis

Adrien Traverse

Olivier Ropars

Alain Domingo

Arnaud Frappart

Sylvain Bourgeade

Dominique Chauvin

Murielle De-Tullio

Vincent Lemineur

Julien Cladiere

François Harle

Alvaro Villa-Recio

Philippe Dondey

Antoine Jallet

Cecile Roussel

Nicolas Besnard

Jean Marc D'HARCOURT

Tire

A tire tread for a heavy-duty vehicle of construction plant type and aims to reduce the risk of cracking at the sipe bottom, without significantly reducing the volume of material of the tread so as not to shorten the lifetime of the tire in respect of wear. The tread (I) has transverse sipes () having a depth H and a width E, each transverse sipe () having a radially inner end formed by a bulge () having an end radius R, the transverse sipes () being distributed longitudinally at a longitudinal spacing B, the depth H, the width E of each transverse sipe (), the end radius R of the bulge () and the longitudinal spacing B satisfying the relationship (R*B)/(E*H)>=1.8.

Tire tread for a heavy-duty vehicle of construction plant type

Crown of a tire for a heavy vehicle that is desensitized to attacks. The tire () comprises tread () having a median degree of surface siping TL, expressed in m/m, equal to the ratio between the cumulative length Lof the cuts (), present in a median portion of tread of axial width W, and the median area Aof the radially outer surface () of the tread (), and protective reinforcement () comprising at least two protective layers () that are formed of elastic metallic reinforcers and have a maximum breaking strength R, expressed in daN/m, such that the median degree of surface siping TLof tread () is at least equal to 5 m/mand a coupling ratio C, equal to the ratio between the maximum breaking strength Rand the median degree of surface siping TL, is at least equal to 18 000 daN.

Tire crown for a heavy duty civil engineering vehicle

Tread () having tread surface () axially bounded by edge parts (), and provided with cuts () delimiting material parts forming raised elements (), each raised element () comprising contact face (), there being formed, in a plurality of raised elements (), a ventilation cavity () having a depth at least equal to 70% of the thickness of the tread material to be worn away, each ventilation cavity () being delimited by wall surface () ending at bottom surface (). Each ventilation cavity () comprises first cavity part () continued into the depth by second cavity part (). The first cavity part () is situated between the tread surface and intermediate depth level Hsituated at between 30% and 70% of maximum depth H of ventilation cavity (), the mean relief angle A of the wall is at least equal to 20 degrees. In the second cavity part (), mean relief angle B of the wall is at most equal to 15 degrees.

Tread for civil engineering machine tire comprising improved ventilation cavities

Tread () of a tire for an off-road vehicle, with total width (W) and total thickness of wearable material at least equal to 60 mm. The tread is delimited axially by shoulder regions () provided with grooves (). This tread () comprises, in central region (), narrow groove () and, between each shoulder region () and the central region (), an intermediate region () in which there are formed a plurality of oblique or transverse narrow grooves (). Narrow groove () of the central part is made up of first narrow-groove parts () of depth (P) and of second narrow-groove parts () of depth (P). Depth (P) is greater than depth (P). Narrow grooves () of one same intermediate region comprise, in the circumferential direction, an alternation of narrow grooves () of first depth (P) and of narrow grooves () of second depth (P).

Tire tread comprising cutouts of different depths

The tread comprises a plurality of blocks, each block being delimited by transverse or oblique grooves and circumferential grooves. Each block is provided with a sipe which has three branches. The branches have common ends. A first branch is oriented in a transverse or oblique direction. A second branch and a third branch each open when new into a transverse groove delimiting the block. The angle formed between the first and second branches is 100 to 125 degrees, and the angle formed between the first and the third branches is 100 to 125 degrees. After wear, each sipe represents between 45% and 70% of the total wearable thickness, such that the lengths of the three branches measured on the new tread surface, L', L&#x2032;, L&#x2032; respectively, are shorter than the lengths L, L, Lrespectively measured on the tread surface when new.

Tread for an earthmover tire, comprising incised blocks

A method for evaluating the thermal stresses associated with the use of a tire mounted on a rim, the method comprising the steps during which a temperature of a gaseous fluid contained in an internal cavity of the tire, and a temperature of the rim, are measured at regular time intervals, and a temperature at at least one internal zone of the materials of which the tire is made is estimated using a pre-established law connecting this temperature to the temperature of the gaseous fluid contained in the internal cavity of the tire and to the temperature of the rim.

Method for determining the temperature of an internal part of the materials of a tire

Tire tread

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Clermont-Ferrand, France

Olivier Spinnler